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# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 21, page id 727094130:0033
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lelos retecti in focum parabola, si modo superticies rerectionis
fuerir concaricas parabola.
PrOP. 12. Problema.
Ea datis positione, uno foco una verrice, cnm ellipseos, vel hyperbola
Specie; Fllipsem vel FCyperbolam invenire.
CIE A vercex ellip(eOS A L. D, B FOCUS, Scque uE Fad GH, ic2
Ddistancia focorum ellipseos AL. D, ad iptius axem: quaerieur
illius aXis, e
Focorum di-
Ctancia. Fix
GHI autera-
TUT MN, ∞-
qualis ipae F,
IEAUECM CIE.
aequalis NH,
HaEque UE C
N, 2dOHI, ita
AB, ad AD;
GEQ; AC, _-
qualis ips B
D: Dico AD
esse arem el-
sip(eosA L.D,
e C, B, illi-
US FOCOS.
Duoniam enim uE CN: CH:: AB: A D; erieue
ON: AB:: GHI: AD; _E uE
GH: A. D:: NHI: BD3
CH: AD: : 2 NHI:. 2 BD;
OH: AD: : MN= -F: C B; hoc eAt
E: GH:: C B: AD;
quod erac oltendendum. alem eriam modo eller praecedencius,
lala  e L C CD ast.
PrOP.
l A esser focus Hyperbola lex, L. 2d C ts, sallo axeos ad. a1
29
5. 190